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Oracle Cloud Database Services 2025 Professional Sample Questions (Q53-Q58):

NEW QUESTION # 53
When migrating a MySQL instance to MySQL HeatWave, which method generally provides the MINIMAL downtime for large databases?

A. Using a third-party ETL tool to extract, transform, and load the data into the HeatWave instance.
B. Copying the data files directly from the source instance to the HeatWave instance.
C. Utilizing MySQL replication to replicate data to the HeatWave instance and then performing a switchover.
D. Creating a physical backup using MySQL Enterprise Backup and restoring it to the HeatWave instance.
E. Using mysqldump to create a logical backup and restoring it to the HeatWave instance.

Answer: C

Explanation:
Using MySQL Replication for Minimal Downtime:
Replication allows forreal-time synchronizationbetween the source MySQL instance and theHeatWave instance. Once the replication catches up, performing aswitchoverto the HeatWave instance ensures minimal disruption.
* This method is especially effective forlarge databases, as data is continuouslysynchronized during the migration process.
* The switchover itself incurs minimal downtime as the applications are redirected to the new instance.
Why the other options are incorrect:
* A:mysqldump and restore are time-consuming for large datasets.
* B:Physical backup and restore are faster than logical, but still involve significant downtime.
* D:Direct data file copying is risky and may cause data corruption.
* E:ETL processes are typically slow and prone to data consistency issues.

NEW QUESTION # 54
Which prerequisite is NOT required before enabling the Database Management Service for a cloud database in Oracle Cloud Infrastructure?

A. The Oracle Management Agent must be installed and running on the database host, if applicable.
B. The database must be configured with automatic backups enabled.
C. The necessary IAM policies must be in place to grant the Database Management Service access to the database.
D. The database must be running and accessible.

Answer: B

Explanation:
Database Management Prerequisites:
To enable Database Management, the following are necessary:
* A:The database must be running to collect metrics.
* B:IAM policies must grant access to the management service.
* D:The Oracle Management Agent must be configured to collect data.
However,automatic backupsare not a requirement for enabling Database Management, as the service focuses onperformance monitoring and management, not data recovery.
Why the other options are correct:
* Ensuring the database is running and accessible is essential for monitoring.
* Proper IAM policies are crucial for security and data access.
* The Management Agent facilitates data collection.

NEW QUESTION # 55
Oracle NoSQL Database Cloud Service utilizes a key-value data model. Which of the following statements accurately describes the fundamental structure of data within this model?

A. Relationships between data items are explicitly defined through foreign keys and joins.
B. Data is structured in a graph format, representing entities as nodes and relationships as edges.
C. Data is organized into tables with predefined schemas, similar to relational databases.
D. Data is stored as JSON documents with flexible structures, allowing for nested elements.
E. Each data item is uniquely identified by a key, and the associated value can be any data type or structure.

Answer: E

Explanation:
C: Each data item is uniquely identified by a key, and the associated value can be any data type or structure.
Key-Value Data Model:
* The key-value model is fundamentally based on a simple association between a unique key and its corresponding value.
* The value can be a simple data type (string, number) or a complex structure (like JSON).
* Oracle NoSQL Database Cloud Service uses this model to ensure efficient, scalable data access.
Why the other options are incorrect:
* A. Organized into tables with schemas:This represents a relational database model.
* B. Stored as JSON documents:Although NoSQL can store JSON, the fundamental model is still key- value.
* D. Relationships defined through foreign keys and joins:This is typical of relational databases.
* E. Graph format with nodes and edges:Represents a graph database model, not key-value.

NEW QUESTION # 56
Which data formats are directly supported by the HeatWave Lakehouse feature for querying data in object storage?

A. CSV, Parquet, and Avro files.
B. Only CSV (Comma Separated Values) files.
C. Only JSON files.
D. Only Parquet files.
E. Only XML files.

Answer: A

Explanation:
C: CSV, Parquet, and Avro files:
* HeatWave Lakehousecan directly query data stored inOCI Object Storagewithout loading it into MySQL.
* Supports widely-used data formats:
* CSV (Comma Separated Values): Simple, text-based data format.
* Parquet: Columnar storage format optimized for analytical queries.
* Avro: Row-oriented format used for data serialization.
* This versatility allows integrating data from various sources and querying directly.
Why the other options are incorrect:
* A. Only CSV files:HeatWave supports more than just CSV.
* B. Only Parquet files:HeatWave also supports CSV and Avro.
* D. Only JSON files:JSON is not directly supported by HeatWave Lakehouse.
* E. Only XML files:XML is not directly supported.

NEW QUESTION # 57
Within the context of Oracle Cloud Infrastructure (OCI) Base Database Service (BaseDB) virtual machine (VM) provisioning, which action is typically the RESPONSIBILITY of the customer?

A. Automatically applying critical security patches to the operating system.
B. Maintaining the OCI hypervisor software.
C. Ensuring the underlying hardware infrastructure remains fault-tolerant.
D. Managing the Oracle Grid Infrastructure software stack.

Answer: D

Explanation:
B: Managing the Oracle Grid Infrastructure software stack:
* Customers are responsible for the installation, configuration, and maintenance of the Oracle Grid Infrastructure when using BaseDB VMs.
* This includes managing Oracle Clusterware and Automatic Storage Management (ASM) if applicable.
* Ensuring the Grid Infrastructure's availability and performance is part of customer-managed tasks.
Why the other options are incorrect:
* A. Hardware fault tolerance:Managed by Oracle Cloud Infrastructure.
* C. Hypervisor maintenance:Handled by Oracle as part of the OCI infrastructure.
* D. Security patching:While OCI provides tools, the responsibility for OS patching lies with the customer.

NEW QUESTION # 58
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